experiments required sampling by SCUBA-equipped divers, and divers also 

 measured and adjusted, as necessary, the bed-referenced elevations of OBS 

 and other sensors at the end of each wave run. The tracer experiments mea- 

 sured dispersion of sand in the offshore, as a comparison to transport rates 

 obtained with the OBS, and recorded macro-scale movement and layering of 

 sand in regions of rapid morphologic change, such as in areas of bar forma- 

 tion and dune erosion. See Chapters 5 and 6 for detailed descriptions of the 

 tracer and OBS measurements, respectively. 



Test Series 



The 20 major data collection tests performed during SUPERTANK are 

 listed in Table 1-1. Wave conditions designed to produce erosion or accretion 

 were selected using predictive criteria described by Kraus, Larson, and 

 Kriebel (1991), both for monochromatic and random waves. Several tests had 

 objectives separate from monitoring evolution of the beach profile, such as 

 dedicated hydrodynamic, suspended sediment, and instrument tests that exam- 

 ined local fluid and sediment transport conditions. 



Representative wave conditions are listed in Table 1-1. For tests involv- 

 ing random waves, the wave height is the significant (zero-moment) height, 

 and the period is the peak spectral period. Sixty-six different wave conditions 

 were run for a total of 129 hr of wave excitation; 70 percent of the wave 

 conditions involved random waves. A detailed listing of the individual wave 

 runs comprising each test, the associated water level, and comments on the 

 test regarding unusual conditions or problems are given in Table 1-2. The 

 table is long and is included at the end of this chapter and in Appendix A, 

 which is contained in Volume II of this report. 



Table 1-2 is essential for identifying data collection runs. Six-digit run 

 numbers are given in the first column of Table 1-2. The first digit is the 

 month (A for August and S for September), the second and third digits are the 

 day of the month, the fourth and fifth digits give the hour (24-hr clock, 

 Pacific Daylight Time), and the sixth digit is the run within the given hour (A 

 denotes the first run, B denotes the second run, etc.). The standard water 

 level in the channel was 3.0 m, meaning that the water level was located 

 1.5 m below the top of the 4.6-m channel walls. Those runs performed with 

 different water depths are so designated explicitly in Table 1-2. If there is no 

 depth information in the right-hand (comments) column, the water level was at 

 3 m. 



In the following sections, a short description is given of each test, together 

 with one or more pictures of conditions or actions representing the test. 



14 



Chapter 1 Introduction to SUPERTANK 



